dtoverlays: Rework vc4-kms-dpi overlays to remove duplication

Removes all the common panel, dpi, and backlight configuration
from the individual vc4-kms-dpi-* files into vc4-kms-dpi.dtsi.

Creates a new vc4-kms-dpi-panel-overlay.dts for preconfigured
panels, with overrides to enable the different panel configurations.

Deprecates vc4-kms-dpi-at056tn53v1 as superceded by vc4-kms-dpi-panel.
vc4-kms-kippah-7inch not deprecated for now as it is likely to be
in wider use than at056tn53v1.

Signed-off-by: Dave Stevenson <[email protected]>

Author: 6by9

arch/arm/boot/dts/overlays/Makefile

@@ -232,8 +232,8 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	upstream-pi4.dtbo \
 	vc4-fkms-v3d.dtbo \
 	vc4-fkms-v3d-pi4.dtbo \
-	vc4-kms-dpi-at056tn53v1.dtbo \
 	vc4-kms-dpi-generic.dtbo \
+	vc4-kms-dpi-panel.dtbo \
 	vc4-kms-dsi-7inch.dtbo \
 	vc4-kms-dsi-lt070me05000.dtbo \
 	vc4-kms-dsi-lt070me05000-v2.dtbo \

arch/arm/boot/dts/overlays/README

@@ -3599,10 +3599,8 @@ Params: cma-512                 CMA is 512MB (needs 1GB)
 
 
 Name:   vc4-kms-dpi-at056tn53v1
-Info:   Enable an Innolux 5.6in VGA TFT connected to DPI interface under KMS.
-        Requires vc4-kms-v3d to be loaded.
-Load:   dtoverlay=vc4-kms-dpi-at056tn53v1
-Params: <None>
+Info:   This overlay is now deprecated - see vc4-kms-dpi-panel,at056tn53v1
+Load:   <Deprecated>
 
 
 Name:   vc4-kms-dpi-generic
@@ -3652,6 +3650,33 @@ Params: clock-frequency         Display clock frequency (Hz)
                                 (default 16).
 
 
+Name:   vc4-kms-dpi-panel
+Info:   Enable a preconfigured KMS DPI panel.
+        Requires vc4-kms-v3d to be loaded.
+Load:   dtoverlay=vc4-kms-dpi-panel,<param>=<val>
+Params: at056tn53v1             Enable an Innolux 5.6in VGA TFT
+        kippah-7inch            Enable an Adafruit Kippah with 7inch panel.
+        backlight-gpio          Defines a GPIO to be used for backlight control
+                                (default of none).
+        backlight-pwm           Defines a PWM channel to be used for backlight
+                                control (default of none). NB Disables audio
+                                headphone output as that also uses PWM.
+        backlight-pwm-chan      Choose channel on &pwm node for backlight
+                                control.
+                                (default 0).
+        backlight-pwm-gpio      GPIO pin to be used for the PWM backlight. See
+                                pwm-2chan for valid options.
+                                (default 18 - note this can only work with
+                                 rgb666-padhi).
+        backlight-pwm-func      Pin function of GPIO used for the PWM
+                                backlight.
+                                See pwm-2chan for valid options.
+                                (default 2).
+        backlight-def-brightness
+                                Set the default brightness. Normal range 1-16.
+                                (default 16).
+
+
 Name:   vc4-kms-dsi-7inch
 Info:   Enable the Raspberry Pi DSI 7" screen.
         Includes the edt-ft5406 for the touchscreen element.

arch/arm/boot/dts/overlays/overlay_map.dts

@@ -151,6 +151,10 @@
 		bcm2711;
 	};
 
+	vc4-kms-dpi-at056tn53v1 {
+		deprecated = "use vc4-kms-dpi-panel,at056tn53v1";
+	};
+
 	vc4-kms-v3d {
 		bcm2835;
 		bcm2711 = "vc4-kms-v3d-pi4";

arch/arm/boot/dts/overlays/vc4-kms-dpi-at056tn53v1-overlay.dts

@@ -5,124 +5,43 @@
 /dts-v1/;
 /plugin/;
 
-#include <dt-bindings/gpio/gpio.h>
-#include <dt-bindings/pinctrl/bcm2835.h>
+#include "vc4-kms-dpi.dtsi"
 
 / {
 	compatible = "brcm,bcm2835";
 
 	fragment@0 {
-		target-path = "/";
-		__overlay__ {
-			panel: panel {
-				compatible = "panel-dpi";
-
-				width-mm = <154>;
-				height-mm = <83>;
-				bus-format = <0x1009>;
-
-				timing: panel-timing {
-					clock-frequency = <29500000>;
-					hactive = <800>;
-					hfront-porch = <24>;
-					hsync-len = <72>;
-					hback-porch = <96>;
-					hsync-active = <1>;
-					vactive = <480>;
-					vfront-porch = <3>;
-					vsync-len = <10>;
-					vback-porch = <7>;
-					vsync-active = <1>;
-
-					de-active = <1>;
-					pixelclk-active = <1>;
-				};
-
-				port {
-					panel_in: endpoint {
-						remote-endpoint = <&dpi_out>;
-					};
-				};
+		target = <&panel>;
+		__overlay__  {
+			compatible = "panel-dpi";
+
+			width-mm = <154>;
+			height-mm = <83>;
+			bus-format = <0x1009>;
+
+			timing: panel-timing {
+				clock-frequency = <29500000>;
+				hactive = <800>;
+				hfront-porch = <24>;
+				hsync-len = <72>;
+				hback-porch = <96>;
+				hsync-active = <1>;
+				vactive = <480>;
+				vfront-porch = <3>;
+				vsync-len = <10>;
+				vback-porch = <7>;
+				vsync-active = <1>;
+
+				de-active = <1>;
+				pixelclk-active = <1>;
 			};
 		};
 	};
 
 	fragment@1 {
 		target = <&dpi>;
-		dpi_node: __overlay__  {
-			status = "okay";
-
-			pinctrl-names = "default";
+		__overlay__  {
 			pinctrl-0 = <&dpi_18bit_gpio0>;
-
-			port {
-				dpi_out: endpoint {
-					remote-endpoint = <&panel_in>;
-				};
-			};
-		};
-	};
-
-	fragment@2 {
-		target = <&panel>;
-		__dormant__  {
-			backlight = <&backlight>;
-		};
-	};
-
-	fragment@3 {
-		target-path = "/";
-		__dormant__  {
-			backlight: backlight {
-				compatible = "gpio-backlight";
-				gpios = <&gpio 255 GPIO_ACTIVE_HIGH>;
-			};
-		};
-	};
-
-	fragment@4 {
-		target = <&panel>;
-		__dormant__  {
-			backlight = <&backlight_pwm>;
-		};
-	};
-
-	fragment@5 {
-		target-path = "/";
-		__dormant__  {
-			backlight_pwm: backlight_pwm {
-				compatible = "pwm-backlight";
-				brightness-levels = <0 6 8 12 16 24 32 40 48 64 96 128 160 192 224 255>;
-				default-brightness-level = <16>;
-				pwms = <&pwm 0 200000>;
-			};
-		};
-	};
-
-	fragment@6 {
-		target = <&pwm>;
-		__dormant__ {
-			pinctrl-names = "default";
-			pinctrl-0 = <&pwm_pins>;
-			assigned-clock-rates = <1000000>;
-			status = "okay";
-		};
-	};
-
-	fragment@7 {
-		target = <&gpio>;
-		__dormant__ {
-			pwm_pins: pwm_pins {
-				brcm,pins = <18>;
-				brcm,function = <2>; /* Alt5 */
-			};
-		};
-	};
-
-	fragment@8 {
-		target = <&audio>;
-		__dormant__  {
-		    brcm,disable-headphones;
 		};
 	};
 
@@ -151,12 +70,5 @@
 		rgb888 = <&panel>, "bus-format:0=0x100a",
 			<&dpi_node>, "pinctrl-0:0=",<&dpi_gpio0>;
 		bus-format = <&panel>, "bus-format:0";
-		backlight-gpio = <0>, "+2+3",
-			<&backlight>, "gpios:4";
-		backlight-pwm = <0>, "+4+5+6+7+8";
-		backlight-pwm-chan = <&backlight_pwm>, "pwms:4";
-		backlight-pwm-gpio = <&pwm_pins>, "brcm,pins:0";
-		backlight-pwm-func = <&pwm_pins>, "brcm,function:0";
-		backlight-def-brightness = <&backlight_pwm>, "default-brightness-level:0";
 	};
 };

arch/arm/boot/dts/overlays/vc4-kms-dpi-generic-overlay.dts

@@ -0,0 +1,62 @@
+/*
+ * vc4-kms-dpi-panel-overlay.dts
+ * Support for any predefined DPI panel.
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include "vc4-kms-dpi.dtsi"
+
+/ {
+	compatible = "brcm,bcm2835";
+
+	fragment@0 {
+		target = <&panel>;
+		__dormant__  {
+			compatible = "innolux,at056tn53v1", "simple-panel";
+		};
+	};
+	fragment@1 {
+		target = <&panel>;
+		__dormant__  {
+			compatible = "ontat,yx700wv03", "simple-panel";
+		};
+	};
+
+	fragment@90 {
+		target = <&dpi>;
+		__dormant__  {
+			pinctrl-0 = <&dpi_18bit_cpadhi_gpio0>;
+		};
+	};
+	fragment@91 {
+		target = <&dpi>;
+		__dormant__  {
+			pinctrl-0 = <&dpi_18bit_gpio0>;
+		};
+	};
+	fragment@92 {
+		target = <&dpi>;
+		__dormant__  {
+			pinctrl-0 = <&dpi_gpio0>;
+		};
+	};
+	fragment@93 {
+		target = <&dpi>;
+		__dormant__  {
+			pinctrl-0 = <&dpi_16bit_cpadhi_gpio0>;
+		};
+	};
+	fragment@94 {
+		target = <&dpi>;
+		__dormant__  {
+			pinctrl-0 = <&dpi_16bit_gpio0>;
+		};
+	};
+
+	__overrides__ {
+		at056tn53v1 = <0>, "+0+90";
+		kippah-7inch = <0>, "+1+91";
+	};
+};